Need Help with Stopping Combat

[Phrozin]

I'm working on a Hulk perk. Once health reaches 40% or less, the PC's stats and race change (Green race.) In order to make it more Hulk like, using a quest, I also made the faction MS13CanMez (just to test it) enemy of the player. After health returns to above 40%, I set another quest to set that faction to an ally and used StopCombat, yet they continue to attack. Maybe someone knows of a better method to have every human NPCs attack while in Hulk mode, then stop when unHulked.